Data-driven prediction-based system and method for trajectory planning of autonomous vehicles

ABSTRACT

A data-driven prediction-based system and method for trajectory planning of autonomous vehicles are disclosed. A particular embodiment includes: generating a first suggested trajectory for an autonomous vehicle; generating predicted resulting trajectories of proximate agents using a prediction module; scoring the first suggested trajectory based on the predicted resulting trajectories of the proximate agents; generating a second suggested trajectory for the autonomous vehicle and generating corresponding predicted resulting trajectories of proximate agents, if the score of the first suggested trajectory is below a minimum acceptable threshold; and outputting a suggested trajectory for the autonomous vehicle wherein the score corresponding to the suggested trajectory is at or above the minimum acceptable threshold.

PRIORITY/RELATED DOCUMENTS

This patent document claims the benefit of U.S. patent application Ser. No. 15/698,607, filed on Sep. 7, 2017, which is incorporated herein by reference in its entirety for all purposes.

COPYRIGHT NOTICE

A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the U.S. Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. The following notice applies to the disclosure herein and to the drawings that form a part of this document: Copyright 2016-2020, TuSimple, All Rights Reserved.

TECHNICAL FIELD

This patent document pertains generally to tools (systems, apparatuses, methodologies, computer program products, etc.) for trajectory planning, vehicle control systems, and autonomous driving systems, and more particularly, but not by way of limitation, to a data-driven prediction-based system and method for trajectory planning of autonomous vehicles.

BACKGROUND

An autonomous vehicle is often configured to follow a trajectory based on a computed driving path. However, when variables such as obstacles are present on the driving path, the autonomous vehicle must perform control operations so that the vehicle may be safely driven by changing the driving path to avoid the obstacles.

In the related art, autonomous vehicle control operations have been determined by representing spatial information (e.g., a coordinate, a heading angle, a curvature, etc.) of the driving path as a polynomial expression or mathematical function for a movement distance in order to avoid a stationary obstacle. However, when dynamic obstacles are present on the driving path, the autonomous vehicle according to the related art may not accurately predict whether or not the vehicle will collide with the dynamic obstacles. In particular, the related art does not consider the interaction between the autonomous vehicle and other dynamic vehicles. Therefore, conventional autonomous vehicle control systems cannot accurately predict the future positions of other proximate dynamic vehicles. As a result, the optimal behavior of the conventional autonomous vehicle cannot be achieved. For example, the unexpected behavior of a proximate dynamic obstacle may result in a collision with the conventional autonomous vehicle.

SUMMARY

A system and method for providing trajectory planning of autonomous vehicles is disclosed herein. Specifically, the present disclosure relates generally to trajectory planning for autonomous vehicles using a data-driven prediction-based method. In one aspect, the system herein may include various sensors, configured to collect data, a computing device, and a prediction module for predicting trajectory of other vehicles and/or dynamic objects in the vicinity of the autonomous vehicle. Initially, the computing device generates a trajectory option, while the prediction module predicts reactions of vehicles and/or dynamic objects examined using data concerning likely trajectories of each vehicle and/or dynamic objects respectively. Data corresponding to predicted reaction can be sent to the computing device to perfect the trajectory option suggested initially. The computing device may subsequently instruct the prediction module to further collect data and conduct predictions to complete the trajectory planning process.

BRIEF DESCRIPTION OF THE DRAWINGS

The various embodiments are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings in which:

FIG. 1 illustrates a block diagram of an example ecosystem in which a prediction-based trajectory planning module of an example embodiment can be implemented;

FIG. 2 illustrates a training phase for training and building a prediction-based trajectory planning system in an example embodiment;

FIGS. 3 and 4 illustrate the components of the prediction-based trajectory planning system of an example embodiment;

FIG. 5 illustrates an example driving scenario showing the prediction-based trajectory planning of an example embodiment;

FIG. 6 is a process flow diagram illustrating an example embodiment of a data-driven prediction-based system and method for trajectory planning of autonomous vehicles; and

FIG. 7 shows a diagrammatic representation of machine in the example form of a computer system within which a set of instructions when executed may cause the machine to perform any one or more of the methodologies discussed herein.

DETAILED DESCRIPTION

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various embodiments. It will be evident, however, to one of ordinary skill in the art that the various embodiments may be practiced without these specific details.

As described in various example embodiments, a data-driven prediction-based system and method for trajectory planning of autonomous vehicles are described herein. An example embodiment disclosed herein can be used in the context of an in-vehicle control system 150 in a vehicle ecosystem 101. In one example embodiment, an in-vehicle control system 150 with a prediction-based trajectory planning module 200 resident in a vehicle 105 can be configured like the architecture and ecosystem 101 illustrated in FIG. 1 . However, it will be apparent to those of ordinary skill in the art that the prediction-based trajectory planning module 200 described and claimed herein can be implemented, configured, and used in a variety of other applications and systems as well.

Referring now to FIG. 1 , a block diagram illustrates an example ecosystem 101 in which an in-vehicle control system 150 and a prediction-based trajectory planning module 200 of an example embodiment can be implemented. These components are described in more detail below. Ecosystem 101 includes a variety of systems and components that can generate and/or deliver one or more sources of information/data and related services to the in-vehicle control system 150 and the prediction-based trajectory planning module 200, which can be installed in the vehicle 105. For example, a camera installed in the vehicle 105, as one of the devices of vehicle subsystems 140, can generate image and timing data that can be received by the in-vehicle control system 150. The in-vehicle control system 150 and an image processing module executing therein can receive this image and timing data input. The image processing module can extract object data from the image and timing data to identify objects in the proximity of the vehicle. As described in more detail below, the prediction-based trajectory planning module 200 can process the object data and generate a trajectory for the vehicle based on the detected objects. The trajectory can be used by an autonomous vehicle control subsystem, as another one of the subsystems of vehicle subsystems 140. The autonomous vehicle control subsystem, for example, can use the real-time generated trajectory to safely and efficiently navigate the vehicle 105 through a real world driving environment while avoiding obstacles and safely controlling the vehicle.

In an example embodiment as described herein, the in-vehicle control system 150 can be in data communication with a plurality of vehicle subsystems 140, all of which can be resident in a user's vehicle 105. A vehicle subsystem interface 141 is provided to facilitate data communication between the in-vehicle control system 150 and the plurality of vehicle subsystems 140. The in-vehicle control system 150 can be configured to include a data processor 171 to execute the prediction-based trajectory planning module 200 for processing object data received from one or more of the vehicle subsystems 140. The data processor 171 can be combined with a data storage device 172 as part of a computing system 170 in the in-vehicle control system 150. The data storage device 172 can be used to store data, processing parameters, and data processing instructions. A processing module interface 165 can be provided to facilitate data communications between the data processor 171 and the prediction-based trajectory planning module 200. In various example embodiments, a plurality of processing modules, configured similarly to prediction-based trajectory planning module 200, can be provided for execution by data processor 171. As shown by the dashed lines in FIG. 1 , the prediction-based trajectory planning module 200 can be integrated into the in-vehicle control system 150, optionally downloaded to the in-vehicle control system 150, or deployed separately from the in-vehicle control system 150.

The in-vehicle control system 150 can be configured to receive or transmit data from/to a wide-area network 120 and network resources 122 connected thereto. An in-vehicle web-enabled device 130 and/or a user mobile device 132 can be used to communicate via network 120. A web-enabled device interface 131 can be used by the in-vehicle control system 150 to facilitate data communication between the in-vehicle control system 150 and the network 120 via the in-vehicle web-enabled device 130. Similarly, a user mobile device interface 133 can be used by the in-vehicle control system 150 to facilitate data communication between the in-vehicle control system 150 and the network 120 via the user mobile device 132. In this manner, the in-vehicle control system 150 can obtain real-time access to network resources 122 via network 120. The network resources 122 can be used to obtain processing modules for execution by data processor 171, data content to train internal neural networks, system parameters, or other data.

The ecosystem 101 can include a wide area data network 120. The network 120 represents one or more conventional wide area data networks, such as the Internet, a cellular telephone network, satellite network, pager network, a wireless broadcast network, gaming network, WiFi network, peer-to-peer network, Voice over IP (VoIP) network, etc. One or more of these networks 120 can be used to connect a user or client system with network resources 122, such as websites, servers, central control sites, or the like. The network resources 122 can generate and/or distribute data, which can be received in vehicle 105 via in-vehicle web-enabled devices 130 or user mobile devices 132. The network resources 122 can also host network cloud services, which can support the functionality used to compute or assist in processing object input or object input analysis. Antennas can serve to connect the in-vehicle control system 150 and the prediction-based trajectory planning module 200 with the data network 120 via cellular, satellite, radio, or other conventional signal reception mechanisms. Such cellular data networks are currently available (e.g., Verizon™, AT&T™, T-Mobile™, etc.). Such satellite-based data or content networks are also currently available (e.g., SiriusXM™, HughesNet™, etc.). The conventional broadcast networks, such as AM/FM radio networks, pager networks, UHF networks, gaming networks, WiFi networks, peer-to-peer networks, Voice over IP (VoIP) networks, and the like are also well-known. Thus, as described in more detail below, the in-vehicle control system 150 and the prediction-based trajectory planning module 200 can receive web-based data or content via an in-vehicle web-enabled device interface 131, which can be used to connect with the in-vehicle web-enabled device receiver 130 and network 120. In this manner, the in-vehicle control system 150 and the prediction-based trajectory planning module 200 can support a variety of network-connectable in-vehicle devices and systems from within a vehicle 105.

As shown in FIG. 1 , the in-vehicle control system 150 and the prediction-based trajectory planning module 200 can also receive data, object processing control parameters, and training content from user mobile devices 132, which can be located inside or proximately to the vehicle 105. The user mobile devices 132 can represent standard mobile devices, such as cellular phones, smartphones, personal digital assistants (PDA's), MP3 players, tablet computing devices (e.g., iPad), laptop computers, CD players, and other mobile devices, which can produce, receive, and/or deliver data, object processing control parameters, and content for the in-vehicle control system 150 and the prediction-based trajectory planning module 200. As shown in FIG. 1 , the mobile devices 132 can also be in data communication with the network cloud 120. The mobile devices 132 can source data and content from internal memory components of the mobile devices 132 themselves or from network resources 122 via network 120. Additionally, mobile devices 132 can themselves include a GPS data receiver, accelerometers, WiFi triangulation, or other geo-location sensors or components in the mobile device, which can be used to determine the real-time geo-location of the user (via the mobile device) at any moment in time. In any case, the in-vehicle control system 150 and the prediction-based trajectory planning module 200 can receive data from the mobile devices 132 as shown in FIG. 1 .

Referring still to FIG. 1 , the example embodiment of ecosystem 101 can include vehicle operational subsystems 140. For embodiments that are implemented in a vehicle 105, many standard vehicles include operational subsystems, such as electronic control units (ECUs), supporting monitoring/control subsystems for the engine, brakes, transmission, electrical system, emissions system, interior environment, and the like. For example, data signals communicated from the vehicle operational subsystems 140 (e.g., ECUs of the vehicle 105) to the in-vehicle control system 150 via vehicle subsystem interface 141 may include information about the state of one or more of the components or subsystems of the vehicle 105. In particular, the data signals, which can be communicated from the vehicle operational subsystems 140 to a Controller Area Network (CAN) bus of the vehicle 105, can be received and processed by the in-vehicle control system 150 via vehicle subsystem interface 141. Embodiments of the systems and methods described herein can be used with substantially any mechanized system that uses a CAN bus or similar data communications bus as defined herein, including, but not limited to, industrial equipment, boats, trucks, machinery, or automobiles; thus, the term “vehicle” as used herein can include any such mechanized systems. Embodiments of the systems and methods described herein can also be used with any systems employing some form of network data communications; however, such network communications are not required.

Referring still to FIG. 1 , the example embodiment of ecosystem 101, and the vehicle operational subsystems 140 therein, can include a variety of vehicle subsystems in support of the operation of vehicle 105. In general, the vehicle 105 may take the form of a car, truck, motorcycle, bus, boat, airplane, helicopter, lawn mower, earth mover, snowmobile, aircraft, recreational vehicle, amusement park vehicle, farm equipment, construction equipment, tram, golf cart, train, and trolley, for example. Other vehicles are possible as well. The vehicle 105 may be configured to operate fully or partially in an autonomous mode. For example, the vehicle 105 may control itself while in the autonomous mode, and may be operable to determine a current state of the vehicle and its environment, determine a predicted behavior of at least one other vehicle in the environment, determine a confidence level that may correspond to a likelihood of the at least one other vehicle to perform the predicted behavior, and control the vehicle 105 based on the determined information. While in autonomous mode, the vehicle 105 may be configured to operate without human interaction.

The vehicle 105 may include various vehicle subsystems such as a vehicle drive subsystem 142, vehicle sensor subsystem 144, vehicle control subsystem 146, and occupant interface subsystem 148. As described above, the vehicle 105 may also include the in-vehicle control system 150, the computing system 170, and the prediction-based trajectory planning module 200. The vehicle 105 may include more or fewer subsystems and each subsystem could include multiple elements. Further, each of the subsystems and elements of vehicle 105 could be interconnected. Thus, one or more of the described functions of the vehicle 105 may be divided up into additional functional or physical components or combined into fewer functional or physical components. In some further examples, additional functional and physical components may be added to the examples illustrated by FIG. 1 .

The vehicle drive subsystem 142 may include components operable to provide powered motion for the vehicle 105. In an example embodiment, the vehicle drive subsystem 142 may include an engine or motor, wheels/tires, a transmission, an electrical subsystem, and a power source. The engine or motor may be any combination of an internal combustion engine, an electric motor, steam engine, fuel cell engine, propane engine, or other types of engines or motors. In some example embodiments, the engine may be configured to convert a power source into mechanical energy. In some example embodiments, the vehicle drive subsystem 142 may include multiple types of engines or motors. For instance, a gas-electric hybrid car could include a gasoline engine and an electric motor. Other examples are possible.

The wheels of the vehicle 105 may be standard tires. The wheels of the vehicle 105 may be configured in various formats, including a unicycle, bicycle, tricycle, or a four-wheel format, such as on a car or a truck, for example. Other wheel geometries are possible, such as those including six or more wheels. Any combination of the wheels of vehicle 105 may be operable to rotate differentially with respect to other wheels. The wheels may represent at least one wheel that is fixedly attached to the transmission and at least one tire coupled to a rim of the wheel that could make contact with the driving surface. The wheels may include a combination of metal and rubber, or another combination of materials. The transmission may include elements that are operable to transmit mechanical power from the engine to the wheels. For this purpose, the transmission could include a gearbox, a clutch, a differential, and drive shafts. The transmission may include other elements as well. The drive shafts may include one or more axles that could be coupled to one or more wheels. The electrical system may include elements that are operable to transfer and control electrical signals in the vehicle 105. These electrical signals can be used to activate lights, servos, electrical motors, and other electrically driven or controlled devices of the vehicle 105. The power source may represent a source of energy that may, in full or in part, power the engine or motor. That is, the engine or motor could be configured to convert the power source into mechanical energy. Examples of power sources include gasoline, diesel, other petroleum-based fuels, propane, other compressed gas-based fuels, ethanol, fuel cell, solar panels, batteries, and other sources of electrical power. The power source could additionally or alternatively include any combination of fuel tanks, batteries, capacitors, or flywheels. The power source may also provide energy for other subsystems of the vehicle 105.

The vehicle sensor subsystem 144 may include a number of sensors configured to sense information about an environment or condition of the vehicle 105. For example, the vehicle sensor subsystem 144 may include an inertial measurement unit (IMU), a Global Positioning System (GPS) transceiver, a RADAR unit, a laser range finder/LIDAR unit, and one or more cameras or image capture devices. The vehicle sensor subsystem 144 may also include sensors configured to monitor internal systems of the vehicle 105 (e.g., an O2 monitor, a fuel gauge, an engine oil temperature). Other sensors are possible as well. One or more of the sensors included in the vehicle sensor subsystem 144 may be configured to be actuated separately or collectively in order to modify a position, an orientation, or both, of the one or more sensors.

The IMU may include any combination of sensors (e.g., accelerometers and gyroscopes) configured to sense position and orientation changes of the vehicle 105 based on inertial acceleration. The GPS transceiver may be any sensor configured to estimate a geographic location of the vehicle 105. For this purpose, the GPS transceiver may include a receiver/transmitter operable to provide information regarding the position of the vehicle 105 with respect to the Earth. The RADAR unit may represent a system that utilizes radio signals to sense objects within the local environment of the vehicle 105. In some embodiments, in addition to sensing the objects, the RADAR unit may additionally be configured to sense the speed and the heading of the objects proximate to the vehicle 105. The laser range finder or LIDAR unit may be any sensor configured to sense objects in the environment in which the vehicle 105 is located using lasers. In an example embodiment, the laser range finder/LIDAR unit may include one or more laser sources, a laser scanner, and one or more detectors, among other system components. The laser range finder/LIDAR unit could be configured to operate in a coherent (e.g., using heterodyne detection) or an incoherent detection mode. The cameras may include one or more devices configured to capture a plurality of images of the environment of the vehicle 105. The cameras may be still image cameras or motion video cameras.

The vehicle control system 146 may be configured to control operation of the vehicle 105 and its components. Accordingly, the vehicle control system 146 may include various elements such as a steering unit, a throttle, a brake unit, a navigation unit, and an autonomous control unit.

The steering unit may represent any combination of mechanisms that may be operable to adjust the heading of vehicle 105. The throttle may be configured to control, for instance, the operating speed of the engine and, in turn, control the speed of the vehicle 105. The brake unit can include any combination of mechanisms configured to decelerate the vehicle 105. The brake unit can use friction to slow the wheels in a standard manner. In other embodiments, the brake unit may convert the kinetic energy of the wheels to electric current. The brake unit may take other forms as well. The navigation unit may be any system configured to determine a driving path or route for the vehicle 105. The navigation unit may additionally be configured to update the driving path dynamically while the vehicle 105 is in operation. In some embodiments, the navigation unit may be configured to incorporate data from the prediction-based trajectory planning module 200, the GPS transceiver, and one or more predetermined maps so as to determine the driving path for the vehicle 105. The autonomous control unit may represent a control system configured to identify, evaluate, and avoid or otherwise negotiate potential obstacles in the environment of the vehicle 105. In general, the autonomous control unit may be configured to control the vehicle 105 for operation without a driver or to provide driver assistance in controlling the vehicle 105. In some embodiments, the autonomous control unit may be configured to incorporate data from the prediction-based trajectory planning module 200, the GPS transceiver, the RADAR, the LIDAR, the cameras, and other vehicle subsystems to determine the driving path or trajectory for the vehicle 105. The vehicle control system 146 may additionally or alternatively include components other than those shown and described.

Occupant interface subsystems 148 may be configured to allow interaction between the vehicle 105 and external sensors, other vehicles, other computer systems, and/or an occupant or user of vehicle 105. For example, the occupant interface subsystems 148 may include standard visual display devices (e.g., plasma displays, liquid crystal displays (LCDs), touchscreen displays, heads-up displays, or the like), speakers or other audio output devices, microphones or other audio input devices, navigation interfaces, and interfaces for controlling the internal environment (e.g., temperature, fan, etc.) of the vehicle 105.

In an example embodiment, the occupant interface subsystems 148 may provide, for instance, means for a user/occupant of the vehicle 105 to interact with the other vehicle subsystems. The visual display devices may provide information to a user of the vehicle 105. The user interface devices can also be operable to accept input from the user via a touchscreen. The touchscreen may be configured to sense at least one of a position and a movement of a user's finger via capacitive sensing, resistance sensing, or a surface acoustic wave process, among other possibilities. The touchscreen may be capable of sensing finger movement in a direction parallel or planar to the touchscreen surface, in a direction normal to the touchscreen surface, or both, and may also be capable of sensing a level of pressure applied to the touchscreen surface. The touchscreen may be formed of one or more translucent or transparent insulating layers and one or more translucent or transparent conducting layers. The touchscreen may take other forms as well.

In other instances, the occupant interface subsystems 148 may provide means for the vehicle 105 to communicate with devices within its environment. The microphone may be configured to receive audio (e.g., a voice command or other audio input) from a user of the vehicle 105. Similarly, the speakers may be configured to output audio to a user of the vehicle 105. In one example embodiment, the occupant interface subsystems 148 may be configured to wirelessly communicate with one or more devices directly or via a communication network. For example, a wireless communication system could use 3G cellular communication, such as CDMA, EVDO, GSM/GPRS, or 4G cellular communication, such as WiMAX or LTE. Alternatively, the wireless communication system may communicate with a wireless local area network (WLAN), for example, using WIFI®. In some embodiments, the wireless communication system 146 may communicate directly with a device, for example, using an infrared link, BLUETOOTH®, or ZIGBEE®. Other wireless protocols, such as various vehicular communication systems, are possible within the context of the disclosure. For example, the wireless communication system may include one or more dedicated short range communications (DSRC) devices that may include public or private data communications between vehicles and/or roadside stations.

Many or all of the functions of the vehicle 105 can be controlled by the computing system 170. The computing system 170 may include at least one data processor 171 (which can include at least one microprocessor) that executes processing instructions stored in a non-transitory computer readable medium, such as the data storage device 172. The computing system 170 may also represent a plurality of computing devices that may serve to control individual components or subsystems of the vehicle 105 in a distributed fashion. In some embodiments, the data storage device 172 may contain processing instructions (e.g., program logic) executable by the data processor 171 to perform various functions of the vehicle 105, including those described herein in connection with the drawings. The data storage device 172 may contain additional instructions as well, including instructions to transmit data to, receive data from, interact with, or control one or more of the vehicle drive subsystem 140, the vehicle sensor subsystem 144, the vehicle control subsystem 146, and the occupant interface subsystems 148.

In addition to the processing instructions, the data storage device 172 may store data such as object processing parameters, training data, roadway maps, and path information, among other information. Such information may be used by the vehicle 105 and the computing system 170 during the operation of the vehicle 105 in the autonomous, semi-autonomous, and/or manual modes.

The vehicle 105 may include a user interface for providing information to or receiving input from a user or occupant of the vehicle 105. The user interface may control or enable control of the content and the layout of interactive images that may be displayed on a display device. Further, the user interface may include one or more input/output devices within the set of occupant interface subsystems 148, such as the display device, the speakers, the microphones, or a wireless communication system.

The computing system 170 may control the function of the vehicle 105 based on inputs received from various vehicle subsystems (e.g., the vehicle drive subsystem 140, the vehicle sensor subsystem 144, and the vehicle control subsystem 146), as well as from the occupant interface subsystem 148. For example, the computing system 170 may use input from the vehicle control system 146 in order to control the steering unit to avoid an obstacle detected by the vehicle sensor subsystem 144 and follow a path or trajectory generated by the prediction-based trajectory planning module 200. In an example embodiment, the computing system 170 can be operable to provide control over many aspects of the vehicle 105 and its subsystems.

Although FIG. 1 shows various components of vehicle 105, e.g., vehicle subsystems 140, computing system 170, data storage device 172, and prediction-based trajectory planning module 200, as being integrated into the vehicle 105, one or more of these components could be mounted or associated separately from the vehicle 105. For example, data storage device 172 could, in part or in full, exist separate from the vehicle 105. Thus, the vehicle 105 could be provided in the form of device elements that may be located separately or together. The device elements that make up vehicle 105 could be communicatively coupled together in a wired or wireless fashion.

Additionally, other data and/or content (denoted herein as ancillary data) can be obtained from local and/or remote sources by the in-vehicle control system 150 as described above. The ancillary data can be used to augment, modify, or train the operation of the prediction-based trajectory planning module 200 based on a variety of factors including, the context in which the user is operating the vehicle (e.g., the location of the vehicle, the specified destination, direction of travel, speed, the time of day, the status of the vehicle, etc.), and a variety of other data obtainable from the variety of sources, local and remote, as described herein.

In a particular embodiment, the in-vehicle control system 150 and the prediction-based trajectory planning module 200 can be implemented as in-vehicle components of vehicle 105. In various example embodiments, the in-vehicle control system 150 and the prediction-based trajectory planning module 200 in data communication therewith can be implemented as integrated components or as separate components. In an example embodiment, the software components of the in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 can be dynamically upgraded, modified, and/or augmented by use of the data connection with the mobile devices 132 and/or the network resources 122 via network 120. The in-vehicle control system 150 can periodically query a mobile device 132 or a network resource 122 for updates or updates can be pushed to the in-vehicle control system 150.

As described in various example embodiments, a data-driven prediction-based system and method for trajectory planning of autonomous vehicles are described herein. Referring now to FIG. 2 , an example embodiment disclosed herein can be used in the context of a prediction-based trajectory planning system 202 for autonomous vehicles. In particular, the real world data collection system 201 can be used to train or configure processing parameters for the prediction-based trajectory planning system 202. As described in more detail below for an example embodiment, the prediction-based trajectory planning system 202 can generate vehicle trajectories based object data 210 provided to the prediction-based trajectory planning system 202 and based on the training the prediction-based trajectory planning system 202 receives from the data collection system 201. The data collection system 201 can include an array of perception information gathering devices or sensors that may include image generating devices (e.g., cameras), light amplification by stimulated emission of radiation (laser) devices, light detection and ranging (LIDAR) devices, global positioning system (GPS) devices, sound navigation and ranging (sonar) devices, radio detection and ranging (radar) devices, and the like. The perception information gathered by the information gathering devices at various traffic locations can include traffic or vehicle image data, roadway data, environmental data, distance data from LIDAR or radar devices, and other sensor information received from the information gathering devices of the data collection system 201 positioned adjacent to particular roadways (e.g., monitored locations). Additionally, the data collection system 201 can include information gathering devices installed in moving test vehicles being navigated through pre-defined routings in an environment or location of interest. The perception information can include data from which a position and velocity of neighboring vehicles in the vicinity of or proximate to the autonomous vehicle can be obtained or calculated. Corresponding ground truth data can also be gathered by the data collection system 201.

The real world data collection system 201 can collect actual trajectories of vehicles and corresponding ground truth data under different scenarios and different driver intentions. The different scenarios can correspond to different locations, different traffic patterns, different environmental conditions, and the like. The scenarios can be represented, for example, by an occupancy grid, a collection of vehicle states on a map, or a graphical representation, such as a top-down image of one or more areas of interest. The driver intentions can correspond to a driver's short term driving goals, such as merging to a ramp, making right turn at an intersection, making a U-turn, and the like. The driver intentions can also correspond to a set of driver or vehicle control actions to accomplish a particular short term driving goal.

The image data and other perception data and ground truth data collected by the data collection system 201 reflects truly realistic, real-world traffic information related to the locations or routings, the scenarios, and the driver intentions being monitored. Using the standard capabilities of well-known data collection devices, the gathered traffic and vehicle image data and other perception or sensor data can be wirelessly transferred (or otherwise transferred) to a data processor of a standard computing system, upon which the real world data collection system 201 can be executed. Alternatively, the gathered traffic and vehicle image data and other perception or sensor data can be stored in a memory device at the monitored location or in the test vehicle and transferred later to the data processor of the standard computing system. The traffic and vehicle image data and other perception or sensor data, the ground truth data and the driver intention data gathered or calculated by the real world data collection system 201 can be used to generate training data, which can be processed by the prediction-based trajectory planning system 202 in a training phase. For example, as well-known, neural networks can be trained to produce configured output based on training data provided to the neural network or other machine learning system in a training phase. The training data provided by the real world data collection system 201 can be used to train the prediction-based trajectory planning system 202 to build a generative prediction model (prediction module 175 shown in FIG. 3 ) that can predict vehicles' future trajectories given their current context and the training received during the training phase. As a result, the prediction-based trajectory planning system 202 can use the machine learning training provided by the real world data collection system 201 in the training phase and the real-world object data 210 to create corresponding vehicle or object trajectories in a data-driven prediction model. As a result, the example embodiments use the real world data collection system 201 to collect data corresponding to human driving behaviors and then use the prediction-based trajectory planning system 202 to generate predicted vehicle trajectories based on the human driving behaviors. Additionally, example embodiments can use a loss function to examine and correct the results of the training provided to the prediction-based trajectory planning system 202 by the real world data collection system 201.

In an example embodiment, the processing performed by the prediction-based trajectory planning system 202 can be divided into two stages: an offline training phase, and an operational phase. In the offline training phase, the processed data provided by the real world data collection system 201 can be used to train the prediction-based trajectory planning system 202, which can build the trajectory prediction module 175 (shown in FIG. 3 ), the use of which is described in more detail below. In an example embodiment, the prediction module 175 can be implemented as a neural network, which can be trained using the processed data provided by the real world data collection system 201. As a result, the prediction module 175 can be trained to simulate or predict the behavior and trajectories of vehicles with drivers in a real-world scenario based on the processed data provided by the real world data collection system 201. Because the prediction module 175 is trained using real world, human behavior data, the predicted behavior and trajectories of vehicles produced by the prediction module 175 is closely correlated to the actual behavior and trajectories of vehicles in a real world environment with human drivers and based on a human driver behavior model.

After the prediction module 175 is trained in the training phase as described above, the prediction module 175 can be deployed in an operational phase of the prediction-based trajectory planning system 202. In the operational phase, the prediction-based trajectory planning system 202 can generate predicted vehicle trajectories based on a human driver behavior model as described above. The operational phase of the prediction-based trajectory planning system 202 is described in more detail below.

As a result of the processing performed by the prediction-based trajectory planning system 202, data corresponding to predicted or simulated driver behaviors and predicted or simulated vehicle trajectories can be produced and fed back into the prediction-based trajectory planning system 202 to improve the accuracy of the predicted trajectories. A loss calculation can be performed for this purpose. Ultimately, the improved prediction-based trajectory planning system 202 can be used to provide highly accurate predicted traffic trajectory information to a user or for configuration of a control system of an autonomous vehicle. In particular, the predicted or simulated traffic trajectory information can be provided to a system component used to create a virtual world where a control system for an autonomous vehicle can be trained and improved. The virtual world is configured to be identical (as possible) to the real world where vehicles are operated by human drivers. In other words, the predicted or simulated traffic trajectory information generated by the prediction-based trajectory planning system 202 is directly and indirectly useful for configuring the control systems for an autonomous vehicle. It will be apparent to those of ordinary skill in the art that the prediction-based trajectory planning system 202 and the predicted or simulated traffic trajectory information described and claimed herein can be implemented, configured, processed, and used in a variety of other applications and systems as well.

Referring now to FIG. 3 , a diagram illustrates an example embodiment of the components of the prediction-based trajectory planning system 202 and the prediction-based trajectory planning module 200 therein. In the example embodiment, the prediction-based trajectory planning module 200 can be configured to include a trajectory processing module 173 and the prediction module 175. As described in more detail below, the trajectory processing module 173 and the prediction module 175 serve to enable generation of a trajectory for the vehicle based on input object data 210 received from one or more of the vehicle sensor subsystems 144, including one or more cameras, and processed by an image processing module to identify proximate agents (e.g., moving vehicles, dynamic objects, or other objects in the proximate vicinity of the vehicle). The generated vehicle trajectories are also based on the training of the prediction module 175 in the human driver behavior model by the real world data collection system 201 as described above. The trajectory processing module 173 and the prediction module 175 can be configured as software modules executed by the data processor 171 of the in-vehicle control system 150. The modules 173 and 175 of the prediction-based trajectory planning module 200 can receive the input object data 210 and produce a trajectory 220, which can be used by the autonomous control subsystem of the vehicle control subsystem 146 to more efficiently and safely control the vehicle 105. As part of their trajectory planning processing, the trajectory processing module 173 and the prediction module 175 can be configured to work with trajectory planning and prediction configuration parameters 174, which can be used to customize and fine tune the operation of the prediction-based trajectory planning module 200. The trajectory planning and prediction configuration parameters 174 can be stored in a memory 172 of the in-vehicle control system 150.

In the example embodiment, the prediction-based trajectory planning module 200 can be configured to include an interface with the in-vehicle control system 150, as shown in FIG. 1 , through which the prediction-based trajectory planning module 200 can send and receive data as described herein. Additionally, the prediction-based trajectory planning module 200 can be configured to include an interface with the in-vehicle control system 150 and/or other ecosystem 101 subsystems through which the prediction-based trajectory planning module 200 can receive ancillary data from the various data sources described above. As described above, the prediction-based trajectory planning module 200 can also be implemented in systems and platforms that are not deployed in a vehicle and not necessarily used in or with a vehicle.

In an example embodiment as shown in FIG. 3 , the prediction-based trajectory planning module 200 can be configured to include the trajectory processing module 173 and the prediction module 175, as well as other processing modules not shown for clarity. Each of these modules can be implemented as software, firmware, or other logic components executing or activated within an executable environment of the prediction-based trajectory planning module 200 operating within or in data communication with the in-vehicle control system 150. Each of these modules of an example embodiment is described in more detail below in connection with the figures provided herein.

Data-Driven Prediction-Based System and Method for Trajectory Planning of Autonomous Vehicles

A system and method for providing trajectory planning of autonomous vehicles is disclosed herein. Specifically, the present disclosure relates generally to trajectory planning for autonomous vehicles using a data-driven prediction-based method. In one aspect, the system herein may include various sensors, configured to collect data, a computing device, and a prediction module for predicting trajectory of other vehicles and/or dynamic objects in the vicinity of the autonomous vehicle. Initially, the computing device generates a trajectory option, while the prediction module predicts reactions of vehicles and/or dynamic objects examined using data concerning likely trajectories of each vehicle and/or dynamic objects respectively. Data corresponding to predicted reaction can be sent to the computing device to perfect the trajectory option suggested initially. The computing device may subsequently instruct the prediction module to further collect data and conduct predictions to complete the trajectory planning process.

FIG. 4 illustrates the components of the prediction-based trajectory planning module 200 of an example embodiment. As shown, the prediction-based trajectory planning module 200 can be configured to include a trajectory processing module 173 and a prediction module 175. The prediction-based trajectory planning module 200, and the trajectory processing module 173 therein, can receive input object data 210 from one or more of the vehicle sensor subsystems 144, including one or more cameras. The image data from the vehicle sensor subsystems 144 can be processed by an image processing module to identify proximate agents or other objects (e.g., moving vehicles, dynamic objects, or other objects in the proximate vicinity of the vehicle 105). The process of semantic segmentation can be used for this purpose. The information related to the identified proximate agents or other objects can be received by the prediction-based trajectory planning module 200, and the trajectory processing module 173 therein, as input object data 210. The trajectory processing module 173 can use the input object data 210 as part of a trajectory planning process. In particular, the trajectory processing module 173 can initially generate a first suggested trajectory for the autonomous vehicle 105. The first suggested trajectory can correspond to a particular path for navigating the vehicle 105 to a desired destination. The first suggested trajectory can also correspond to a particular path for controlling the vehicle 105 to avoid obstacles detected in the proximity of the vehicle 105. The first suggested trajectory can also correspond to a particular path for directing the vehicle 105 to perform a particular action, such as passing another vehicle, adjusting speed or heading to maintain separation from other vehicles, maneuvering the vehicle in turns, performing a controlled stop, or the like. In each of these cases, the first suggested trajectory may cause the vehicle 105 to make a sequential change on its speed and heading. As a result of changes in the vehicle's 105 speed or heading, other agents or vehicles on the roadway proximate to the vehicle 105 may react to the vehicle's 105 change in speed or heading or other action. The prediction module 175 is provided in an example embodiment to anticipate or predict the likely reactions of the proximate agents to the vehicle's 105 change in speed or heading. Thus, the trajectory processing module 173 can provide the first suggested trajectory as an input to the prediction module 175. The prediction module 175 can use the first suggested trajectory to generate the likely trajectories, or a distribution of likely trajectories of proximate agents, which are predicted to result from the vehicle 105 following the first suggested trajectory. These likely trajectories of proximate agents can be determined based on the machine learning techniques configured from the training scenarios produced from prior real-world human driver behavior model data collections gathered and trained using the real world data collection system 201 as described above. These likely trajectories can also be configured or tuned using the configuration data 310. Over the course of collecting data from many human driver behavior model driving scenarios and training machine datasets and rule sets (or neural nets or the like), the likely trajectories of proximate agents can be determined with a variable level of confidence or probability. The confidence level or probability value related to a particular predicted trajectory can be retained or associated with the predicted trajectory of each proximate agent detected to be near the vehicle 105 at a point in time corresponding to the desired execution of the first suggested trajectory. The prediction module 175 can generate these predicted trajectories and confidence levels for each proximate agent relative to the first suggested trajectory generated by the trajectory processing module 173. The prediction module 175 can generate the predicted trajectories and corresponding confidence levels for each proximate agent as an output relative to the first suggested trajectory generated by the trajectory processing module 173. As shown in FIG. 4 , the output of the prediction module 175 can be fed back to the trajectory processing module 173 as an input. The trajectory processing module 173 can use the predicted trajectories and corresponding confidence levels for each proximate agent as generated by the prediction module 175 to determine if any of the predicted trajectories for the proximate agents may cause the vehicle 105 to violate a pre-defined goal based on a related score being below a minimum acceptable threshold. The trajectory processing module 173 can score the first suggested trajectory as related to the predicted trajectories for any of the proximate agents. The score for the first suggested trajectory relates to the level to which the first suggested trajectory complies with pre-defined goals for the vehicle 105, including safety, efficiency, legality, passenger comfort, and the like. Minimum score thresholds for each goal can be pre-defined. For example, score thresholds related to turning rates, acceleration or stopping rates, speed, spacing, etc. can be pre-defined and used to determine if a suggested trajectory for vehicle 105 may violate a pre-defined goal. If the score for the first suggested trajectory, as generated by the trajectory processing module 173 based on the predicted trajectories for any of the proximate agents, may violate a pre-defined goal, the trajectory processing module 173 can reject the first suggested trajectory and the trajectory processing module 173 can generate a second suggested trajectory. The second suggested trajectory can be provided to the prediction module 175 for the generation of anew set of predicted trajectories and confidence levels for each proximate agent as related to the second suggested trajectory. The new set of predicted trajectories and confidence levels for each proximate agent as generated by the prediction module 175 can be output from the prediction module 175 and provided as an input to the trajectory processing module 173. Again, the trajectory processing module 173 can use the predicted trajectories and confidence levels for each proximate agent corresponding to the second suggested trajectory to determine if any of the predicted trajectories for the proximate agents may cause the vehicle 105 to violate a pre-defined goal based on a related score being below a minimum acceptable threshold. If the score for the second suggested trajectory, as generated by the trajectory processing module 173 based on the new set of predicted trajectories for any of the proximate agents, may violate a pre-defined goal, the trajectory processing module 173 can reject the second suggested trajectory and the trajectory processing module 173 can generate a third suggested trajectory. This process can be repeated until a suggested trajectory generated by the trajectory processing module 173 and processed by the prediction module 175 results in predicted trajectories and confidence levels for each proximate agent that cause the suggested trajectory for the vehicle 105 to satisfy the pre-defined goals based on the a related score being at or above a minimum acceptable threshold. Alternatively, the process can be repeated until a time period or iteration count is exceeded. If the process of an example embodiment as described above results in predicted trajectories, confidence levels, and related scores that satisfy the pre-defined goals, the corresponding suggested trajectory 220 is provided as an output from the prediction-based trajectory planning module 200 as shown in FIG. 4 .

FIG. 5 illustrates an example driving scenario 401 showing the prediction-based trajectory planning of an example embodiment. In the example embodiment, the prediction-based trajectory planning module 200 uses object data 210 received from the vehicle sensor subsystem and the predicted trajectories and confidence levels or probabilities for proximate agents as generated by the prediction module 175, as described above. Referring to FIG. 5 , the trajectory processing module 173 may initially generate a first proposed or suggested trajectory or path 410 for the autonomous vehicle A at a given point in time. A trajectory or path can be specified as a collection of waypoints from a current vehicle position to a desired vehicle position along a designated path. For example, as shown in FIG. 5 , an autonomous vehicle A is shown on a roadway with multiple lanes. For purposes of the illustrated example, the prediction-based trajectory planning module 200 can be considered resident in or operating with the autonomous vehicle A. In the illustrated example, a proximate agent B (e.g., another vehicle or dynamic object on the roadway) occupies a position behind and to the right of the autonomous vehicle A in an adjacent lane and traveling in the same direction of travel. The presence, speed, and heading of the proximate agent B can be determined based on the object data received from the vehicle sensor subsystem.

In the illustrated example of FIG. 5 , the prediction module 175 first provides an initial prediction of the movement of the proximate object (vehicle B), which could be in the form of a set of predicted trajectories with their corresponding probability (e.g., a predicted trajectory distribution), namely, trajectory 422 with probability 0.4, trajectory 424 with probability 0.2, and trajectory 426 with probability 0.4. To further explain the three predicted trajectories in the example of FIG. 5 , predicted trajectory 422 anticipates that the vehicle B will speed up in its current lane; predicted trajectory 424 anticipates that the vehicle B will slow down in its current lane; and predicted trajectory 426 anticipates that the vehicle B will perform a lane change maneuver. The trajectory processing module 173 can generate the first suggested trajectory 410, which enables the vehicle A to smoothly perform a lane change to the right lane in the example of FIG. 5 . As described above, the first suggested trajectory 410 can be sent to the prediction module 175, where anew predicted trajectory distribution is generated based on the first suggested trajectory 410. In this case, the new predicted trajectory distribution is in the form of the same set of trajectory options 422, 424, 426, with updated probability values 0.5, 0.1, 0.4 respectively. To further analyze the example scenario shown in FIG. 5 , vehicle A may try to execute first suggested trajectory 410. However, in this example, vehicle B has a high probability that the driver does not want to give way to vehicle A; and so there is a high probability that vehicle B will speed up to execute trajectory 422 to advance along the current lane. This high probability is indicated by the updated probability value of 0.5 for trajectory option 422 as generated by the prediction module 175. In the next iteration of the trajectory processing module 173, when the first suggested trajectory 410 is proposed and the high probability trajectory 422 is predicted, the score corresponding to the first suggested trajectory 410 relative to the high probability trajectory 422 as generated by the trajectory processing module 173 will be very low, which is indicative that vehicle A will not be able to execute the first suggested trajectory 410 and safely perform the desired lane change behavior until vehicle B gets in front of vehicle A. In this case, the first suggested trajectory 410 will be inefficient, if for example, vehicle A needs to get to the right lane to take a nearby highway exit. If the need to get to the right lane to take an exit is a goal of vehicle A, the execution of the first suggested trajectory 410 will fail to accomplish the goal. In this case, the score for the first suggested trajectory 410, as generated by the trajectory processing module 173, will be very low. After evaluation of the low score for the first suggested trajectory 410, the trajectory processing module 173 may propose a second suggested trajectory 412 where a more aggressive lane change operation will be performed. The trajectory processing module 173 can send this second suggested trajectory 412 to the prediction module 175. The prediction module 175 can generate a new predicted trajectory distribution based on the second suggested trajectory 412. In the example of FIG. 5 , the new predicted trajectory distribution can include proposed trajectory options 422, 424, and 426 with trajectory probabilities of 0.05, 0.55, and 0.4, respectively. These new trajectory probabilities for the predicted movement of vehicle B are caused by the second suggested trajectory 412, if executed by vehicle A. In this example, the execution of the second suggested trajectory 412 by vehicle A will force vehicle B to slow down and perform its predicted trajectory 424 with a higher probability. Because the execution of the second suggested trajectory 412 by vehicle A will enable vehicle A to meet its goal of getting to the right lane to take a nearby highway exit, the score of the second suggested trajectory 412, as generated by the trajectory processing module 173, will be high. Assuming the higher score of the second suggested trajectory 412 meets or exceeds the goal threshold, the trajectory processing module 173 can output the second suggested trajectory 412 as an acceptable trajectory and vehicle A can execute the second suggested trajectory 412.

Note that in this example, the feedback loop between the trajectory processing module 173 and the prediction module 175 is performed for only two iterations and for only one proximate object (e.g., vehicle B). In real cases, there will be more iterations and more proximate object trajectories to predict. Also in each iteration, there could be multiple suggested trajectories instead of only one being sent from the trajectory processing module 173 to the prediction module 175. In these cases, multiple trajectory predictions will be made for each of the suggested trajectories sent to the prediction module 175.

Referring now to FIG. 6 , a flow diagram illustrates an example embodiment of a system and method 1000 for providing trajectory planning of autonomous vehicles. The example embodiment can be configured to: generate a first suggested trajectory for an autonomous vehicle (processing block 1010); generate predicted resulting trajectories of proximate agents using a prediction module (processing block 1020); score the first suggested trajectory based on the predicted resulting trajectories of the proximate agents (processing block 1030); generate a second suggested trajectory for the autonomous vehicle and generate corresponding predicted resulting trajectories of proximate agents, if the score of the first suggested trajectory is below a minimum acceptable threshold (processing block 1040); and output a suggested trajectory for the autonomous vehicle wherein the score corresponding to the suggested trajectory is at or above the minimum acceptable threshold (processing block 1050).

As used herein and unless specified otherwise, the term “mobile device” includes any computing or communications device that can communicate with the in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 described herein to obtain read or write access to data signals, messages, or content communicated via any mode of data communications. In many cases, the mobile device 130 is a handheld, portable device, such as a smart phone, mobile phone, cellular telephone, tablet computer, laptop computer, display pager, radio frequency (RF) device, infrared (IR) device, global positioning device (GPS), Personal Digital Assistants (PDA), handheld computers, wearable computer, portable game console, other mobile communication and/or computing device, or an integrated device combining one or more of the preceding devices, and the like. Additionally, the mobile device 130 can be a computing device, personal computer (PC), multiprocessor system, microprocessor-based or programmable consumer electronic device, network PC, diagnostics equipment, a system operated by a vehicle 119 manufacturer or service technician, and the like, and is not limited to portable devices. The mobile device 130 can receive and process data in any of a variety of data formats. The data format may include or be configured to operate with any programming format, protocol, or language including, but not limited to, JavaScript, C++, iOS, Android, etc.

As used herein and unless specified otherwise, the term “network resource” includes any device, system, or service that can communicate with the in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 described herein to obtain read or write access to data signals, messages, or content communicated via any mode of inter-process or networked data communications. In many cases, the network resource 122 is a data network accessible computing platform, including client or server computers, websites, mobile devices, peer-to-peer (P2P) network nodes, and the like. Additionally, the network resource 122 can be a web appliance, a network router, switch, bridge, gateway, diagnostics equipment, a system operated by a vehicle 119 manufacturer or service technician, or any machine capable of executing a set of instructions (sequential or otherwise) that specify actions to be taken by that machine. Further, while only a single machine is illustrated, the term “machine” can also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein. The network resources 122 may include any of a variety of providers or processors of network transportable digital content. Typically, the file format that is employed is Extensible Markup Language (XML), however, the various embodiments are not so limited, and other file formats may be used. For example, data formats other than Hypertext Markup Language (HTML)/XML or formats other than open/standard data formats can be supported by various embodiments. Any electronic file format, such as Portable Document Format (PDF), audio (e.g., Motion Picture Experts Group Audio Layer 3-MP3, and the like), video (e.g., MP4, and the like), and any proprietary interchange format defined by specific content sites can be supported by the various embodiments described herein.

The wide area data network 120 (also denoted the network cloud) used with the network resources 122 can be configured to couple one computing or communication device with another computing or communication device. The network may be enabled to employ any form of computer readable data or media for communicating information from one electronic device to another. The network 120 can include the Internet in addition to other wide area networks (WANs), cellular telephone networks, metro-area networks, local area networks (LANs), other packet-switched networks, circuit-switched networks, direct data connections, such as through a universal serial bus (USB) or Ethernet port, other forms of computer-readable media, or any combination thereof. The network 120 can include the Internet in addition to other wide area networks (WANs), cellular telephone networks, satellite networks, over-the-air broadcast networks, AM/FM radio networks, pager networks, UHF networks, other broadcast networks, gaming networks, WiFi networks, peer-to-peer networks, Voice Over IP (VoIP) networks, metro-area networks, local area networks (LANs), other packet-switched networks, circuit-switched networks, direct data connections, such as through a universal serial bus (USB) or Ethernet port, other forms of computer-readable media, or any combination thereof. On an interconnected set of networks, including those based on differing architectures and protocols, a router or gateway can act as a link between networks, enabling messages to be sent between computing devices on different networks. Also, communication links within networks can typically include twisted wire pair cabling, USB, Firewire, Ethernet, or coaxial cable, while communication links between networks may utilize analog or digital telephone lines, full or fractional dedicated digital lines including T1, T2, T3, and T4, Integrated Services Digital Networks (ISDNs), Digital User Lines (DSLs), wireless links including satellite links, cellular telephone links, or other communication links known to those of ordinary skill in the art. Furthermore, remote computers and other related electronic devices can be remotely connected to the network via a modem and temporary telephone link.

The network 120 may further include any of a variety of wireless sub-networks that may further overlay stand-alone ad-hoc networks, and the like, to provide an infrastructure-oriented connection. Such sub-networks may include mesh networks, Wireless LAN (WLAN) networks, cellular networks, and the like. The network may also include an autonomous system of terminals, gateways, routers, and the like connected by wireless radio links or wireless transceivers. These connectors may be configured to move freely and randomly and organize themselves arbitrarily, such that the topology of the network may change rapidly. The network 120 may further employ one or more of a plurality of standard wireless and/or cellular protocols or access technologies including those set forth herein in connection with network interface 712 and network 714 described in the figures herewith.

In a particular embodiment, a mobile device 132 and/or a network resource 122 may act as a client device enabling a user to access and use the in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 to interact with one or more components of a vehicle subsystem. These client devices 132 or 122 may include virtually any computing device that is configured to send and receive information over a network, such as network 120 as described herein. Such client devices may include mobile devices, such as cellular telephones, smart phones, tablet computers, display pagers, radio frequency (RF) devices, infrared (IR) devices, global positioning devices (GPS), Personal Digital Assistants (PDAs), handheld computers, wearable computers, game consoles, integrated devices combining one or more of the preceding devices, and the like. The client devices may also include other computing devices, such as personal computers (PCs), multiprocessor systems, microprocessor-based or programmable consumer electronics, network PC's, and the like. As such, client devices may range widely in terms of capabilities and features. For example, a client device configured as a cell phone may have a numeric keypad and a few lines of monochrome LCD display on which only text may be displayed. In another example, a web-enabled client device may have a touch sensitive screen, a stylus, and a color LCD display screen in which both text and graphics may be displayed. Moreover, the web-enabled client device may include a browser application enabled to receive and to send wireless application protocol messages (WAP), and/or wired application messages, and the like. In one embodiment, the browser application is enabled to employ HyperText Markup Language (HTML), Dynamic HTML, Handheld Device Markup Language (HDML), Wireless Markup Language (WML), WMLScript, JavaScript™, EXtensible HTML (xHTML), Compact HTML (CHTML), and the like, to display and send a message with relevant information.

The client devices may also include at least one client application that is configured to receive content or messages from another computing device via a network transmission. The client application may include a capability to provide and receive textual content, graphical content, video content, audio content, alerts, messages, notifications, and the like. Moreover, the client devices may be further configured to communicate and/or receive a message, such as through a Short Message Service (SMS), direct messaging (e.g., Twitter), email, Multimedia Message Service (MMS), instant messaging (IM), internet relay chat (IRC), mIRC, Jabber, Enhanced Messaging Service (EMS), text messaging, Smart Messaging, Over the Air (OTA) messaging, or the like, between another computing device, and the like. The client devices may also include a wireless application device on which a client application is configured to enable a user of the device to send and receive information to/from network resources wirelessly via the network.

The in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 can be implemented using systems that enhance the security of the execution environment, thereby improving security and reducing the possibility that the in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 and the related services could be compromised by viruses or malware. For example, the in-vehicle control system 150 and/or the prediction-based trajectory planning module 200 can be implemented using a Trusted Execution Environment, which can ensure that sensitive data is stored, processed, and communicated in a secure way.

FIG. 7 shows a diagrammatic representation of a machine in the example form of a computing system 700 within which a set of instructions when executed and/or processing logic when activated may cause the machine to perform any one or more of the methodologies described and/or claimed herein. In alternative embodiments, the machine operates as a standalone device or may be connected (e.g., networked) to other machines. In a networked deployment, the machine may operate in the capacity of a server or a client machine in server-client network environment, or as a peer machine in a peer-to-peer (or distributed) network environment. The machine may be a personal computer (PC), a laptop computer, a tablet computing system, a Personal Digital Assistant (PDA), a cellular telephone, a smartphone, a web appliance, a set-top box (STB), a network router, switch or bridge, or any machine capable of executing a set of instructions (sequential or otherwise) or activating processing logic that specify actions to be taken by that machine. Further, while only a single machine is illustrated, the term “machine” can also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions or processing logic to perform any one or more of the methodologies described and/or claimed herein.

The example computing system 700 can include a data processor 702 (e.g., a System-on-a-Chip (SoC), general processing core, graphics core, and optionally other processing logic) and a memory 704, which can communicate with each other via a bus or other data transfer system 706. The mobile computing and/or communication system 700 may further include various input/output (I/O) devices and/or interfaces 710, such as a touchscreen display, an audio jack, a voice interface, and optionally a network interface 712. In an example embodiment, the network interface 712 can include one or more radio transceivers configured for compatibility with any one or more standard wireless and/or cellular protocols or access technologies (e.g., 2nd (2G), 2.5, 3rd (3G), 4th (4G) generation, and future generation radio access for cellular systems, Global System for Mobile communication (GSM), General Packet Radio Services (GPRS), Enhanced Data GSM Environment (EDGE), Wideband Code Division Multiple Access (WCDMA), LTE, CDMA2000, WLAN, Wireless Router (WR) mesh, and the like). Network interface 712 may also be configured for use with various other wired and/or wireless communication protocols, including TCP/IP, UDP, SIP, SMS, RTP, WAP, CDMA, TDMA, UMTS, UWB, WiFi, WiMax, Bluetooth™, IEEE 802.11x, and the like. In essence, network interface 712 may include or support virtually any wired and/or wireless communication and data processing mechanisms by which information/data may travel between a computing system 700 and another computing or communication system via network 714.

The memory 704 can represent a machine-readable medium on which is stored one or more sets of instructions, software, firmware, or other processing logic (e.g., logic 708) embodying any one or more of the methodologies or functions described and/or claimed herein. The logic 708, or a portion thereof, may also reside, completely or at least partially within the processor 702 during execution thereof by the mobile computing and/or communication system 700. As such, the memory 704 and the processor 702 may also constitute machine-readable media. The logic 708, or a portion thereof, may also be configured as processing logic or logic, at least a portion of which is partially implemented in hardware. The logic 708, or a portion thereof, may further be transmitted or received over a network 714 via the network interface 712. While the machine-readable medium of an example embodiment can be a single medium, the term “machine-readable medium” should be taken to include a single non-transitory medium or multiple non-transitory media (e.g., a centralized or distributed database, and/or associated caches and computing systems) that store the one or more sets of instructions. The term “machine-readable medium” can also be taken to include any non-transitory medium that is capable of storing, encoding or carrying a set of instructions for execution by the machine and that cause the machine to perform any one or more of the methodologies of the various embodiments, or that is capable of storing, encoding or carrying data structures utilized by or associated with such a set of instructions. The term “machine-readable medium” can accordingly be taken to include, but not be limited to, solid-state memories, optical media, and magnetic media.

The Abstract of the Disclosure is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, it can be seen that various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment. 

What is claimed is:
 1. A system comprising: a data processor; and a trajectory planning module, executable by the data processor, configured to: generate a first suggested trajectory for an autonomous vehicle, the first suggested trajectory configured to comply with pre-defined goals for the autonomous vehicle; generate a first distribution of predicted resulting trajectories for each of proximate agents using a prediction module configured to generate a first output in response to receiving the first suggested trajectory as an input, the first distributions of predicted resulting trajectories being reactions to the first suggested trajectory of the autonomous vehicle and generated based on the output of the prediction module fed back to the trajectory planning module, wherein the proximate agents are vehicles in the vicinity of the autonomous vehicle, wherein the first distribution of predicted resulting trajectories includes a first set of predicted trajectories with first probability values obtained based on the first suggested trajectory, wherein each of predicted trajectories in the first distribution has a corresponding first probability value obtained based on the first suggested trajectory; score the first suggested trajectory based on each corresponding first probability value and determine whether a score corresponding to a highest first probability value of the first probability values complies with the pre-defined goals of the autonomous vehicle; generate a second suggested trajectory for the autonomous vehicle upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is below a minimum acceptable threshold, or cause a vehicle control subsystem of the autonomous vehicle to manipulate the autonomous vehicle to follow the first suggested trajectory, upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is at or above the minimum acceptable threshold; generate, upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is below the minimum acceptable threshold, an updated first distribution of the predicted resulting trajectories for each of proximate agents using the prediction module configured to generate a second output in response to receiving the second suggested trajectory as an input, the updated first distribution of the predicted resulting trajectories being reactions to the second suggested trajectory of the autonomous vehicle and generated based on the second output of the prediction module fed back to the trajectory planning module, wherein the updated first distribution of the predicted resulting trajectories includes the first set of predicted trajectories with second probability values obtained based on the second suggested trajectory, wherein each of the predicted trajectories in the updated first distribution has a corresponding second probability value obtained based on the second suggested trajectory; and cause the vehicle control subsystem of the autonomous vehicle to manipulate the autonomous vehicle to follow the second suggested trajectory, upon determination that any of the second probability values is higher than the highest first probability value.
 2. The system of claim 1 wherein the first distribution of predicted resulting trajectories is generated to predict behaviors and trajectories of proximate vehicles.
 3. The system of claim 2 wherein the prediction module is trained with machine learning using a human driving behavior data.
 4. The system of claim 1 wherein the first distributions of predicted resulting trajectories are based on an input object data corresponding to the proximate agents and the first suggested trajectory, wherein the predicted resulting trajectories of each of the first distributions has an associated confidence level.
 5. The system of claim 4 wherein the trajectory planning module is configured to generate the updated first distribution of predicted resulting trajectories for each of the proximate agents using the prediction module, wherein the updated first distribution of predicted resulting trajectories is based on the input object data corresponding to the proximate agents and the second suggested trajectory, wherein the predicted resulting trajectories of the updated first distribution has an associated confidence level.
 6. The system of claim 5 wherein the trajectory planning module is configured to repeatedly generate distributions of predicted resulting trajectories and associated confidence levels, until the score corresponding to the suggested trajectory is at or above the minimum acceptable threshold or until a time period or iteration count is exceeded.
 7. The system of claim 1 wherein the trajectory planning module is configured to output a suggested trajectory for the autonomous vehicle when the score corresponding to the suggested trajectory is at or above the minimum acceptable threshold.
 8. The system of claim 1 wherein the trajectory planning module is configured to output a suggested trajectory for the autonomous vehicle according to the predicted resulting trajectories of the proximate agents.
 9. The system of claim 1 wherein the trajectory planning module and the prediction module form a feedback loop.
 10. A method comprising: generating, by use of a data processor, a first suggested trajectory for an autonomous vehicle, the first suggested trajectory configured to comply with pre-defined goals for the autonomous vehicle; generating, by use of the data processor, a first distribution of predicted resulting trajectories for each of proximate agents using a prediction module configured to generate a first output in response to receiving the first suggested trajectory as an input, the first distributions of predicted resulting trajectories being reactions to the first suggested trajectory of the autonomous vehicle and generated based on the output of the prediction module fed back to a trajectory planning module, wherein the proximate agents are vehicles in the vicinity of the autonomous vehicle, wherein the first distribution of predicted resulting trajectories includes a first set of predicted trajectories with first probability values obtained based on the first suggested trajectory, wherein each of predicted trajectories in the first distribution has a corresponding first probability value obtained based on the first suggested trajectory; scoring, by use of the data processor, the first suggested trajectory based on each corresponding first probability value and determine whether a score corresponding to a highest first probability value of the first probability values complies with the pre-defined goals of the autonomous vehicle; generating, by use of the data processor, a second suggested trajectory for the autonomous vehicle upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is below a minimum acceptable threshold, or causing a vehicle control subsystem of the autonomous vehicle to manipulate the autonomous vehicle to follow the first suggested trajectory, upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is at or above the minimum acceptable threshold; generating, upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is below the minimum acceptable threshold, an updated first distribution of the predicted resulting trajectories for each of proximate agents using the prediction module configured to generate a second output in response to receiving the second suggested trajectory as an input, the updated first distribution of predicted resulting trajectories being reactions to the second suggested trajectory of the autonomous vehicle and generated based on the second output of the prediction module fed back to the trajectory planning module, wherein the updated first distribution of the predicted resulting trajectories includes the first set of predicted trajectories with second probability values obtained based on the second suggested trajectory, wherein each of the predicted trajectories in the updated first distribution has a corresponding second probability value obtained based on the second suggested trajectory; and causing the vehicle control subsystem of the autonomous vehicle to manipulate the autonomous vehicle to follow the second suggested trajectory, upon determination that any of the second probability values is higher than the highest first probability value.
 11. The method of claim 10 comprising creating trajectories for training the prediction module based on an input of a human driving behavior data.
 12. The method of claim 10 comprising causing the prediction module to retain information corresponding to predicted trajectories of proximate agents as polynomial expression or data representations.
 13. The method of claim 10 comprising training the prediction module with machine learning using a real-world data corresponding to human driving behaviors.
 14. The method of claim 13 wherein a loss function is used to examine and correct results of the training.
 15. A non-transitory machine-useable storage medium embodying instructions which, when executed by a data processor, cause the data processor to: generate a first suggested trajectory for an autonomous vehicle, the first suggested trajectory configured to comply with pre-defined goals for the autonomous vehicle; generate a first distribution of predicted resulting trajectories for each of proximate agents using a prediction module configured to generate a first output in response to receiving the first suggested trajectory as an input, the first distributions of predicted resulting trajectories being reactions to the first suggested trajectory of the autonomous vehicle and generated based on the output of the prediction module fed back to a trajectory planning module, wherein the proximate agents are vehicles in the vicinity of the autonomous vehicle, wherein the first distribution of predicted resulting trajectories includes a first set of predicted trajectories with first probability values obtained based on the first suggested trajectory, wherein each of predicted trajectories in the first distribution has a corresponding first probability value obtained based on the first suggested trajectory; score the first suggested trajectory based on each corresponding first probability value and determine whether a score corresponding to a highest first probability value of the first probability values complies with the pre-defined goals of the autonomous vehicle; generate a second suggested trajectory for the autonomous vehicle upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is below a minimum acceptable threshold, or cause a vehicle control subsystem of the autonomous vehicle to manipulate the autonomous vehicle to follow a suggested trajectory, upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is at or above the minimum acceptable threshold; generate, upon determination that the score for the first suggested trajectory corresponding to the highest first probability value is below the minimum acceptable threshold, an updated first distribution of the predicted resulting trajectories for each of proximate agents using the prediction module configured to generate a second output in response to receiving the second suggested trajectory as an input, the updated first distribution of the predicted resulting trajectories being reactions to the second suggested trajectory of the autonomous vehicle and generated based on the second output of the prediction module fed back to the trajectory planning module, wherein the updated first distribution of the predicted resulting trajectories includes the first set of predicted trajectories with second probability values obtained based on the second suggested trajectory, wherein each of the predicted trajectories in the updated first distribution has a corresponding second probability value obtained based on the second suggested trajectory; and cause the vehicle control subsystem of the autonomous vehicle to manipulate the autonomous vehicle to follow the second suggested trajectory, upon determination that any of the second probability values is higher than the highest first probability value.
 16. The non-transitory machine-useable storage medium of claim 15 wherein the instructions are further configured to use one or more vehicle sensor subsystems to generate input object data related to objects detected in proximity to the autonomous vehicle, the input object data comprising speed and trajectory data corresponding to the proximate agents, wherein the proximate agents are detectable by the vehicle sensor subsystems.
 17. The non-transitory machine-useable storage medium of claim 16 wherein each of the vehicle sensor subsystems comprises at least one of an inertial measurement unit (IMU), a Global Positioning System (GPS) transceiver, a radar, a laser range finder, and one or more cameras.
 18. The non-transitory machine-useable storage medium of claim 16 wherein each of the vehicle sensor subsystems comprises at least one of an O₂ monitor, a fuel gauge, and an engine oil temperature.
 19. The non-transitory machine-useable storage medium of claim 16 wherein each of the vehicle sensor subsystems comprises a plurality of sensors, wherein the plurality of sensors are actuated separately or collectively.
 20. The non-transitory machine-useable storage medium of claim 15 wherein the minimum acceptable threshold is a pre-defined score with factors, wherein the factors comprise a turning rate, an acceleration, a stopping rate, and a speed, of the autonomous vehicle, wherein the factors further comprise a spacing between the autonomous vehicle and other vehicles. 